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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1966
5
1967
12
1968
32
1969
27
1970
38
1971
38
1972
68
1973
72
1974
102
1975
80
1976
74
1977
107
1978
70
1979
83
1980
63
1981
63
1982
67
1983
75
1984
78
1985
81
1986
94
1987
73
1988
76
1989
89
1990
63
1991
77
1992
61
1993
59
1994
53
1995
45
1996
62
1997
60
1998
46
1999
56
2000
46
2001
50
2002
67
2003
56
2004
61
2005
70
2006
85
2007
106
2008
102
2009
96
2010
105
2011
86
2012
87
2013
84
2014
75
2015
79
2016
73
2017
73
2018
73
2019
67
2020
44
2021
22
2022
3
2023
1
2024
11
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AMA
APA
MLA
NLM
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AMA
APA
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Adaptive Clinical Trial
Address
Autobiography
Bibliography
Biography
Case Reports
Classical Article
Clinical Conference
Clinical Study
Clinical Trial Protocol
Clinical Trial, Phase I
Clinical Trial, Phase II
Clinical Trial, Phase III
Clinical Trial, Phase IV
Clinical Trial, Veterinary
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Comparative Study
Congress
Consensus Development Conference
Consensus Development Conference, NIH
Controlled Clinical Trial
Corrected and Republished Article
Dataset
Dictionary
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English Abstract
Equivalence Trial
Evaluation Study
Expression of Concern
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Guideline
Historical Article
Interactive Tutorial
Interview
Introductory Journal Article
Lecture
Legal Case
Legislation
Letter
Multicenter Study
News
Newspaper Article
Observational Study
Observational Study, Veterinary
Overall
Patient Education Handout
Periodical Index
Personal Narrative
Portrait
Practice Guideline
Pragmatic Clinical Trial
Preprint
Published Erratum
Randomized Controlled Trial, Veterinary
Research Support, American Recovery and Reinvestment Act
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
Research Support, U.S. Gov't
Retracted Publication
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Scientific Integrity Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
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